Determination of PDFs and $\alpha_{S}(M_{Z})$ from Inclusive and Jet Measurements in DIS @ HERA

TL;DR

This paper presents a combined NLO QCD analysis of HERA data to simultaneously determine proton PDFs and the strong coupling constant, achieving improved precision through the inclusion of jet measurements.

Contribution

It introduces a novel simultaneous fit of PDFs and ppa_S using combined HERA inclusive and jet data, reducing correlations and enhancing accuracy.

Findings

Improved determination of gluon PDF at HERA energies.

Precise measurement of ppa_S(M_Z) from DIS data.

Reduction of uncertainties in proton structure functions.

Abstract

A simultaneous NLO QCD fit of the parton density functions (PDFs) of the proton and of the strong coupling $\alpha_{S}(M_{Z})$ is presented. The analysis is based on combined H1 and ZEUS inclusive DIS cross section measurements together with inclusive jet cross section measurements provided by both H1 and ZEUS collaborations. The inclusion of the jet data significantly reduces the correlation between the gluon PDF and the strong coupling, improving the precision of the gluon PDF and providing an accurate determination of $\alpha_{S}(M_{Z})$ using DIS data from HERA only.